Merge "rust: Mark DeathRecipient Send and Sync" am: 593991bfd9 am: 3d3003b3cf

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2054944

Change-Id: Iabf1ec8f2e53bdf51c24f9e4ff51b13ecd0fab5b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>